a weird regen cycle
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Senior User
Joined: Feb 2007
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From: Colorado
a weird regen cycle
So I am used to some "average" regen numbers on my Edge CTS, typically 2.68 will signal the start of one and it ends around 1.02 +/-. Today, I was pulling my 5th wheel back from camping, driving up some hills and head winds at 70 mph and had cooked off soot in "passive" staying around 1.10 in the last long grade when the exhaust cleaning message appears. It stays in active regen until the soot reading was at .67, then quits. About 15 mins to get there. I had been driving about 2 hours when that happened. I have never seen the soot number go that low, or even start a regen before 2.68ish.The only thing different was a PCM calibration update last week for the dreaded exhaust fluid fault, speed limited in 49 miles msg. Maybe they changed the regen rules? Kinda of strange to initiate one when it was clean, according to the Edge anyway. Anyone else who has an Edge seen active regen start at 1.XX and go down to the .60s? I know this is silly, but makes me think something in the PCM update caused this....or maybe it was just a quirk. Mike
Lead Driver
Joined: Nov 2005
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From: Kaysville Utah
Mine has done that a few times when I'm towing also. There must be some other parameter that triggers the regen besides the soot %. So that when you have a lot of Passive regen going on, it still periodically does an active regardless of Soot %
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Senior User
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From: Colorado
Hmmm, Interesting. Thanks for replying. I obsess over trivial stuff like that. I was telling my wife what was going on while it was happening, her response was oh....mmmmmm.....ok. Which translated is who cares! 
She is amazed though about going 70 - 75mph towing 14,000 lbs with the windows up and a/c going and it feels like we are going 40. I have to put the cruise on to keep speed creep at bay.
She is amazed though about going 70 - 75mph towing 14,000 lbs with the windows up and a/c going and it feels like we are going 40. I have to put the cruise on to keep speed creep at bay.
Super Moderator
Joined: Aug 2008
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From: Frederick, MD
There maybe a backstop built into the programming like the 6.4. If I recall it will regen at around 630 miles if it has not done so because of need.
Probably to ensure EPA compliance.
Probably to ensure EPA compliance.
Post Fiend
Joined: Jan 2009
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From: Greenwood, SC
I agree with Senix. I tow all the time and my active regens have an approx. 700 mile interval. I believe the system performs an active regen no matter what at a certain time interval.
For example, when towing, it is passive regen all the time so you can drive for many hours without an active regen. Something in the programming forces an active regen if the system has detected that an active regen has not been run after a set amount of hours....
For example, when towing, it is passive regen all the time so you can drive for many hours without an active regen. Something in the programming forces an active regen if the system has detected that an active regen has not been run after a set amount of hours....
FTE Chapter Leader
Joined: Jan 2006
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From: North Central Washington
I have seen mine do that before, also it seemed like it took forever to complete. I didn't time it but I drove almost 18 miles during the regen and it soot dropped lower than I have seen it before.
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